Three coplanar parallel straight wires carry equal currents I to the right as shown below. The current in the upper two wires is directed to the right, but the current in the bottom wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.
c
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A diatomic molecule is vibrating in its first excited quantum state above the ground state. In that excited state, its frequency is 2.0 × 1013 Hz
What is the energy of the molecule in this state? (h = 6.626 × 10-34 J ? s, h = 1.055 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J A) 0.12 eV B) 0.15 eV C) 0.041 eV D) 0.17 eV E) 0.083 eV
Quasars are isolated supermassive black holes, and not associated with galaxies
a. True b. False Indicate whether the statement is true or false
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force exerted on a moving charged object is zero.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forcesWhich of the following best explains the origin of metal-rich meteorites?
A) They are leftover chunks of rock from the earliest period in the formation of the solar system. B) They are fragments of comets rather than of asteroids. C) They are fragments of the core of an asteroid that was shattered by a collision. D) They are fragments of rock chipped off the planet Mercury. E) They are fragments of rock chipped off the planet Mars.